Hobby Electronics Basics

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FS: 120 VDC regulated power supplies

I made up a bunch of 120 VDC regulated open frame power supply boards for some of my tube audio projects (go to http://...
0 comments posted 21yrs
posted by ovrreactor
0 comments posted 21yrs posted by ovrreactor

Too short ATR from smartcard

I got an asynchronous smartcard (simple SLE kindof) from a vendor to do some testing to get a unique ID from the card....
0 comments posted 21yrs
posted by weer1
0 comments posted 21yrs posted by weer1

PIC microcontroller

I just purchased a PIC microcontroller. I've used an eval board for the motorola HC11 and it had a serial port built it....
3 comments posted 21yrs
posted by guest
3 comments posted 21yrs posted by guest

Car voltage monitor

I do a lot of work from my car, which is brand new. But I had some current leakage somewhere and the battery drained aw...
7 comments posted 21yrs
posted by grahame9
7 comments posted 21yrs posted by grahame9

Kelvin Sensing?

What is Kelvin Sensing? Bill
5 comments posted 21yrs
posted by wmgray1966
5 comments posted 21yrs posted by wmgray1966

Series resistance in parallel resonance circuits

I have a lab exercise using a AC Voltage source with series resistance hooked up to a parallel capacitor and inductor w...
7 comments posted 21yrs
posted by iliveinatrailerpark
7 comments posted 21yrs posted by iliveinatrailerpark

How to drop a voltage using a series resistor?

Hello. I'm looking at a schematic here that drops a 5V TTL output through a series resistor into a 3.3V LVTTL input. I...
17 comments posted 21yrs
posted by pm940
17 comments posted 21yrs posted by pm940

Photocell backwards / reversed

Is there an off-the-shelf version of a photocell that works in reverse compared to the common variety? I want something...
1 comments posted 21yrs
posted by quakeserver149
1 comments posted 21yrs posted by quakeserver149

Is this even possible? Filter/impedance question

Hi All, A company I'm contracting for told me to design a circuit I did not even think was possible. But is it? They ha...
8 comments posted 21yrs
posted by billcalley
8 comments posted 21yrs posted by billcalley

node voltage analysis

Are you supposed to assume current directions in/out of the nodes when doing node voltage analysis? I have done a few p...
3 comments posted 21yrs
posted by rspinks1
3 comments posted 21yrs posted by rspinks1

UK Alarm dialer circuit

Hi all I was wondering if any body may have a diagram for an alarm dialer, I have a 12 in switched and also a 12v in co...
1 comments posted 21yrs
posted by igarratt
1 comments posted 21yrs posted by igarratt

live wire signal tracer

I'm looking for a low cost (live) line tracer (110v 20A) like an rf signal generator and tracer. I'm looking to trace w...
2 comments posted 21yrs
posted by pzion.naax
2 comments posted 21yrs posted by pzion.naax

Looking to Get Board

Now that Radio Shack is going downhill quick and is no longer selling perfboard, does anybody know where I can find a s...
17 comments posted 21yrs
posted by notat
17 comments posted 21yrs posted by notat